Zie:Inserting Flash Within PowerPoint

Example slide effects with instructions Has 165 PowerPoint 2010 (2007 compatible) PowerPoint templates.
The Microsoft Office Blog - Watch “ppt157: Everything in this video is a PowerPoint Template” has a page with a Silverlight video and links to the different templates.

Use this:

Option Explicit  
Public Sub ChangeSpellCheckingLanguage()  
    Dim j As Integer, k As Integer, scount As Integer, fcount As Integer
    scount = ActivePresentation.Slides.Count
    For j = 1 To scount
        fcount = ActivePresentation.Slides(j).Shapes.Count
        For k = 1 To fcount
            If ActivePresentation.Slides(j).Shapes(k).HasTextFrame Then
                ActivePresentation.Slides(j).Shapes(k) _
                .TextFrame.TextRange.LanguageID = msoLanguageIDEnglishAUS
            End If
        Next k
    Next j
End Sub

With this: MSDN - Office 2007 - MsoLanguageID Enumeration

Source: Super User - Change the spell-checking language on a PowerPoint presentation